Home/Products/Fiber Cabling/Bare Fiber/OM1 OM2 OM3 OM4 Multimode Optical Fiber Bare Fiber

OM1 OM2 OM3 OM4 Multimode Optical Fiber Bare Fiber

★★★★★
Highly Rated

Description

Attenuation3.5dB/km
Cable Length 500 metersInner Diameter 5.3cm,
Outside Diameter 6.5cm,
Height 3.5cm
Cable Length 1000 metersInner Diameter 5.3cm,
Outside Diameter 7.3cm,
Height 3.5cm
Cable Length 2000 metersInner Diameter 5.3cm,
Outside Diameter 9.0cm,
Height 3.5cm
ConnectorFC/SC/ST/LC

FAQ

Q1: What fiber types are available for this multimode bare optical fiber?

A: We offer four types of multimode fiber: OM1 (62.5/125), OM2 (50/125), OM3 (50/125), and OM4 (50/125).

Q2: What is the attenuation rate of this bare fiber?

A: The attenuation rate for this multimode bare optical fiber is 3.5dB/km.

Q3: What cable lengths can I choose from?

A: You can select from multiple lengths to suit your needs, including 100 meters, 200 meters, 300 meters, 500 meters, 1000 meters, and 2000 meters.

Q4: Are connectors included with the bare fiber?

A: You have the flexibility to choose. We offer connector configurations such as SC/UPC-SC/UPC and FC/UPC-FC/UPC. Alternatively, you can select the “No Need Connectors” option if you prefer completely bare fiber. The product generally supports FC, SC, ST, and LC connectors.

Q5: What are the physical dimensions of the spool for different cable lengths?

A: All spools have an inner diameter of 5.3cm and a height of 3.5cm. The outside diameter varies depending on the length of the cable:

  • 500 meters: 6.5cm Outside Diameter
  • 1000 meters: 7.3cm Outside Diameter
  • 2000 meters: 9.0cm Outside Diameter

Customer Reviews

5.0 / 5.0 ★★★★★ Based on 18 customer reviews
Harrison Cole
November 24, 2025

Sourcing the OM3 and OM4 multimode bare fiber spools in 1000m and 2000m lengths has streamlined our custom patch cord manufacturing process. The fiber consistently meets the 3.5dB/km attenuation specification, ensuring stable high-speed transmission across short-reach optical links. The compact spool design (5.3cm inner diameter and 7.3cm–9.0cm outer diameter depending on length) fits neatly onto our benchtop winding and connectorization stations. Having the option to order completely unconnectorized bare glass or pre-terminated FC/SC ends gives us great flexibility for custom OEM orders.

Kenji Sato
March 30, 2026

Excellent optical glass quality for R&D testing and optical equipment calibration. We ordered 500m spools of both OM1 (62.5/125) and OM2 (50/125) bare fiber to validate legacy enterprise transceivers and test fusion splicer arc profiles. The 3.5dB/km attenuation rate is verified across our OTDR traces, and the glass strips cleanly without micro-cracking. The compact 6.5cm outer diameter spool for 500m lengths is easy to store in our test benches, making this a very practical bare fiber supply for benchtop diagnostics.

Rohan Sharma
August 14, 2026

We procured OM4 50/125 multimode bare fiber spools to build custom-length interconnects for enterprise server rack links. The low attenuation rate of 3.5dB/km ensures pristine optical signal margins for high-density multi-gigabit hardware. Choosing the pre-terminated SC/UPC connector option saved our technicians significant field labor during custom assembly terminations. The spools are neatly wound, easy to payout during production, and the optical consistency across 500m and 1000m batches is top-notch.

Showing 3 of 18 top reviews.

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